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| author | Jeff Fan <jeff.fan@intel.com> | 2015-08-25 06:37:27 +0000 |
|---|---|---|
| committer | vanjeff <vanjeff@Edk2> | 2015-08-25 06:37:27 +0000 |
| commit | 669f2b584dd5baf58bdef8b0ca54f182c5f5d430 (patch) | |
| tree | e320afea08e3b299718826a2e81b0ede56fdf3e1 /CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.c | |
| parent | dcfa39fd63a76c504a69ee87a68d7faa3e5638f7 (diff) | |
| download | edk2-UDK2010.SR1.tar.gz edk2-UDK2010.SR1.tar.bz2 edk2-UDK2010.SR1.zip | |
Copy head(r18255) from main trunk excluding UNI files.UDK2010.SR1
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/branches/UDK2010.SR1@18304 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.c')
| -rw-r--r-- | CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.c b/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.c new file mode 100644 index 0000000000..86b10040dd --- /dev/null +++ b/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.c @@ -0,0 +1,57 @@ +/** @file
+ 64-bit Math Worker Function.
+ The 32-bit versions of C compiler generate calls to library routines
+ to handle 64-bit math. These functions use non-standard calling conventions.
+
+Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+
+/*
+ * Shifts a 64-bit unsigned value right by a certain number of bits.
+ */
+__declspec(naked) void __cdecl _aullshr (void)
+{
+ _asm {
+ ;
+ ; Checking: Only handle 64bit shifting or more
+ ;
+ cmp cl, 64
+ jae _Exit
+
+ ;
+ ; Handle shifting between 0 and 31 bits
+ ;
+ cmp cl, 32
+ jae More32
+ shrd eax, edx, cl
+ shr edx, cl
+ ret
+
+ ;
+ ; Handle shifting of 32-63 bits
+ ;
+More32:
+ mov eax, edx
+ xor edx, edx
+ and cl, 31
+ shr eax, cl
+ ret
+
+ ;
+ ; Invalid number (less then 32bits), return 0
+ ;
+_Exit:
+ xor eax, eax
+ xor edx, edx
+ ret
+ }
+}
|